ipfw_insn_rdr
ipfw_insn_rdr *c = (ipfw_insn_rdr *)cmd;
ipfw_insn_rdr *c = (ipfw_insn_rdr *)cmd;
cmd->len = F_INSN_SIZE(ipfw_insn_rdr);
ipfw_insn_rdr *r = (ipfw_insn_rdr *)cmd;
if (cmdlen != F_INSN_SIZE(ipfw_insn_rdr))